Battery change issue - Mercedes Benz SLK Forum

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#1 Old 05-16-2013
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Battery change issue

Wow, 14 years and never any trouble until now. Changed the battery and now dash lights all wonky. Tried reseting using the service light procedure, no luck. Tach doesn't work, temp lite on left reads -38C and the odometer is blank. I've changed batteries before without issues. Any ideas?
1999 230 SLK auto, 72,000 miles
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#2 Old 05-16-2013
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Changed battery as in a new battery? checked cables for rust, etc?


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#3 Old 05-16-2013
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Battery good, car starts fine and all things work-windows, lights, mirrors etc
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#4 Old 05-16-2013
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Forgot to add that the gas gauge needle goes to the wrong place and the low fuel level light is on but fuel tank is full.
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sorry to harp on battery. brand new battery, not a charged battery? how long was the car not hooked up to a battery while you swapped em?


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#6 Old 05-16-2013
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humor me, if some things work, but not all things work, i would disconnect the battery for a minimum of 30 minutes. then reconnect and check everything that was not working.


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#7 Old 05-16-2013
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Battery disconnected for maybe an hour. It is full and good. Everything works but dash lights.
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#8 Old 05-16-2013
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Thanks, will disconnect and try again.
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well something electrical is not happy, so like a computer, i reboot the battery!

and you checked the dash fuses?


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#10 Old 05-16-2013
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fuse locations:

https://www.slkworld.com/r170/complocation.htm


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#11 Old 05-16-2013
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Reconnected, check fuses....no change. When I open the drivers door even with the key not in the ingnition, lights come on the dash and then will go out on their own after about 15 seconds.
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let's wait for the r170 experts to get sober and chime in.


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back to the craps table for you!!


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#15 Old 05-16-2013
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standby, jayson will jump in shortly


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#16 Old 05-16-2013
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Disconnected battery again and put meter on it 12.3 volts. Put charger on it and will check in the morning.
Would 12.3 instead of 12.6 volts cause this?
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Hmmm... that's really weird. Couple thoughts:
1) bare wire somewhere...
2) Check your camshaft sensor (does it leak or not?). Do you see any oil in front of the engine when you remove the plastic cover? Can be seen in this thread:
https://www.slkworld.com/slk-r170-gen...tml#post353735
The reason I ask is that sometimes oil can get into the connector, then it may leak through the harness into the ECU... means bad thing...
3) Read somewhere on benzworld. This resets the ECU memory.
Procedure: Remove the battery from the car! Get a piece of wire, bare the ends. Connect one end to positive terminal and one end to negative. Wait 30-60 seconds. This should reset the ECU. I did that to mine when confronted dead battery for the 1st time and my dash went crazy after I tried to start the car with dying battery.
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#18 Old 05-16-2013
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Check this thread.
https://www.slkworld.com/ask-dansslk/...tml#post246332
May be it'll give you some ideas?!
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#19 Old 05-16-2013
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This all started when I changed MAF sensor. All went well until I tried to reset the check engine light. Resorted to battery disconnect to reset the CEL and that's when the dash lights went weird. Hey, the CEL went out though!
Anyone else tried the ECU reset as suggested? Willing to try it if there is consensus it won't screw up anything else.
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